In a sexual assault case, is a prosecutor permitted to personally vouch for the credibility of his or her witnesses?

The prosecutor is not permitted to personally vouch for the credibility of his or her witnesses because it inserts into the trial facts outside the record and unknown to the jury. (People v. Huggins (2006) 38 Cal.4th 175, 206-207.) However, in closing arguments, the prosecutor is permitted to argue to the jury that, under the circumstances of the case, a witness is telling the truth. (People v. Boyette (2002) 29 Cal.4th 381, 433; People v. Fernandez (2013) 216 Cal.App.4th 540, 561.)

b. Additional Background